How to solve the quadratic equations 6x-4y = 7 and 2x + 5Y = 9

How to solve the quadratic equations 6x-4y = 7 and 2x + 5Y = 9

{6x-4y=7 （1）
2x+5y=9 （2）
（1）-3*（2）
-19y=-20
y=20/19
Substituting (2)
2x+100/19=9
2x=-71/19
x=-71/38

By solving the binary linear equation {8x + 6y = 36x-4y = 5, we get y = () from the equation system {2x + M = 1, Y-3 = m, we can get the relation between X and Y is ()

Solving the binary linear equation {8x + 6y = 3}
6x-4y = 5, y = - 11 / 34
From the equations {2x + M = 1}
Y-3 = m, the relationship between X and Y is (2x + y = 4)

Is 2x + 1 = 4Y + 2x a quadratic equation of two variables
4x-3y = y + X, right

The unknowns are x and y, the highest degree is 1, so it is a quadratic equation
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Solve the system of linear equations of three variables, 2x + 2Y + 2Z = 3904x + 3Y + 2Z = 6155x + 4Y + 2Z = 760

2x+2y+2z=390 (1)
4x+3y+2z=615 (2)
5x+4y+2z=760 (3)
(2)-(1)
2x+y=225 (4)
(3)-(2)
x+y=145 (5)
(4)-(5)
therefore
x=80
y=145-x=65
z=(390-2x-2y)/2=50

Judge whether the following formula is monomial. If yes, please indicate its coefficient and times. If not, please explain the reason briefly
(1) - one third of a's square B (2) - x (3) - π (4) - A-3 (5) 0.6A's Square (6) y (7) 2A
-3b/4

Wrong answer upstairs
(1) Coefficient - one third, degree 3 (2) coefficient - 1, degree 1 (3) coefficient - 1, degree 0 (5) coefficient 0.6, degree 2 (6) coefficient 1, degree 1 These five are monomials

Judge whether the following formulas are monomials, coefficients and times of monomials
(1) 3A; (2) 2XY (2); (3) - 5x10 (2); (4) π (a); (5) 2x (x + 1); (6) 2x (2); (6) x (2); (3) - 5x10 (2); (3); (4) π (a); (5) 2x (x + 1); (6) 2x (2); (6) x (2); (2); (2); (2); (2); (2); (3); (3); (3); (4

1) Yes. Degree 1, coefficient 3
2) Yes. Times 2 factor 1 / 2
3) The coefficient of degree 5 is - 5 × 10 & # 178;
4) Yes. Degree 1, coefficient 1 / π
5) No
6) No. in monomials, there can't be letters in the denominator
7) Yes. The coefficient of degree 6 is - 2 & # 178;

Multiplication of integers, multiplication of monomials and monomials
-0.6A & # 178; · quarter 1A & # 178; B ^ 3 - (- 10 ^ 4) B ^ 3

-0.6A & # 178; · quarter 1A & # 178; B ^ 3 - (- 10 ^ 4) B ^ 3
=-3a*4b³/20+10000b³
=b³（10000-3a*4/20）

What are the coefficients and times of such a single number

For example, 5
Then 5 = 5 * a ^ 0
So the coefficient is itself, the number is zero

The () in the monomial is called the coefficient of the monomial

The (number factor) in the monomial is called the coefficient of the monomial

1. The formula of the product of - or - is called a monomial, and so is a single number or letter; the number of a monomial refers to, and the coefficient of a monomial refers to
2. Several monomials are called polynomials. In polynomials, each monomials is called polynomials, among which - is called constant term, and the degree of the term with the highest degree in polynomials is called -
3. The results obtained from the addition of the terms of the same kind are taken as coefficients and remain unchanged
4. If the factor outside the bracket is a positive number, the sign of each item in the original bracket after removing the bracket is the same as the original sign; if the factor outside the bracket is a negative number, the sign of each item in the original bracket after removing the bracket is the same as the original sign
5. Add and subtract several integers. If there are brackets, remove them first, and then merge them

A formula that is the product of numbers or letters is called a monomial. A single number or letter is also the coefficient of a monomial. The number factor in a monomial is called the coefficient of a monomial. The degree of a monomial: in a monomial, the sum of the exponents of all letters is called the degree of the monomial. The sum of several monomials is called a polynomial, Each monomial is called the term of a polynomial, and the term without letters is called a constant term. The degree of the term with the highest degree in a polynomial is called the degree of a polynomial. The coefficients of the same kind of terms are added together, and the results are taken as coefficients. The exponents of letters and letters remain unchanged if the factors outside the brackets are positive, If the factor outside the brackets is negative, and the symbol inside the brackets is opposite to the original symbol, add and subtract several integers. If there are brackets, remove the brackets first, and then merge the similar items. Hello, I'm very happy to answer your questions, If you are satisfied, please remember to take it. If you have any other questions, please take this question and click to me for help. The answer is not easy, please understand. Thank you. Born for your dream team, I wish you progress in your study_ Help each other and have a happy New Year!